Tb3+ added sulfamic acid single crystals with optimal photoluminescence properties for opto-electric devices

Synthesis, characterization, and thermal behavior of amidosulfonates of transition metals in air and nitrogen atmosphere

“…The main infrared absorption bands were associated with the N-H stretching, namely, a NH3 + broad band at 3400-3300 cm -1 , the N-H stretching as a weak band at 2873 cm -1 and the absorptions observed at 1533 and 1433 cm -1 due to symmetric stretching mode of NH3 + while at 1567 cm -1 is due to asymmetric mode. The SO3stretching vibration was observed in a 1065 cm -1 and at 685 cm -1 , the N-S stretching mode can be seen, all these absorptions agree with the literature [4][5][6][7][8][9][10][11][12][13][14] . The absence of that weak band of N-H stretching is an evidence that de coordination of the metal ions occurred by NH3 + group.…”

“…Luiz, Nunes and Matos 16 studied the thermal behavior of all the amidosulfonates of the rare earth series and observed a mass gain between 250 o C and 350 o C, attributed to an oxidative process SO3 2-→ SO4 2-, which is more evident in a lower heating rate. Brahmaji et al 14 also observed mass gain in this temperature range.…”

“…Although no mass change was observed in this temperature range, there is an exothermic peak at 289 o C (synthetic air and N2) which may be associated with a crystallization process. Brahmaji et al 14 also reported a gain mass in this range temperature, however this thermal event needs to be further investigated. Budurov et al 5 reported endothermic peaks attributed to phase transition at 177 o C (KNH2SO3) and 182 o C (NaNH2SO3).…”

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu3+ and Tb3+ Ion Doping

“…The most intense 5 D 4 → 7 F 5 band was chosen to represent the emission intensity of Tb 3+ ions in the green region for this ion. [51] Due to radiative recombination of electrons through intrinsic surface states of RE-doped LSMH, the visible luminescence arises. [52] For the Eu 3+ and Tb 3+ doped LSMH, the narrow emission peaks arise and are evidently attributed to f-f transitions of Eu 3+ and Tb 3+ ions.…”

“…Also as the defect states of RE-doped LSMH crystals are at the elevated energies than those of the emitting state ( 5 D 0 ) of Eu 3+ and 5 D 4 of Tb 3+ ions, energy transfer to the crystal field states ( 7 F j ) of Eu 3+ and Tb 3+ occurs, resulting in efficient PL spectrum. [51][52][53] This energy transfer mechanism for Eu 3+ and Tb 3+ doped LSMH crystal www.advancedsciencenews.com www.crt-journal.org Figure 12. The energy transfer mechanism in a) Eu 3+ and b) Tb 3+ doped LSMH crystals.…”